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Valence shell electron pair repulsion or VSEPR theory states that the geometry of a molecule or polyatomic ion is determined by the repulsion of pairs of electrons associated with a central atom. The pairs of electrons may be bonding or non-bonding (lone-pair) electrons. Only valence electrons of the central atom influence the molecular shape. All BUT one assumption listed supports VSEPR theory. Which statement is not critical to supporting VSEPR theory?

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Diatonic254
The answer is  Only valence electrons of the central atom influence the molecular shape.

Valence electrons, which are involved in the bonding, do not solely influence the molecular shape but also the non-bonding electrons (lone pair). The repulsion between these non-bonding (lone pair) electrons also influences the position of these and neighboring atoms in space. This is why water molecule is bent at 104.45 degrees due to repulsion of the electron clouds of the oxygen atom.

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